* {
    font-family: 'Microsoft Yahei';
}

.navbar {
    margin-bottom: 0;
    border-radius: 0;
}

.navbar .navbar-brand {
    padding: 7px 15px;
}

.banner {
    background-color: #2b80d9;
}

.banner .item>img {
    margin: 0 auto;
}

.engine {
    padding-top: 70px;
    background-color: #fbfaf7;
}

.engine>.container {
    padding-bottom: 80px;
    background: url('../images/engine-bg.jpg') no-repeat right 60px;
    transition: background .75s;
}

.engine .container>h1 {
    margin-bottom: 35px;
    color: #0078d7;
    font-size: 48px;
    font-weight: bold;
}

.engine .container>h2 {
    margin-bottom: 70px;
    color: #666666;
}

.engine .engine-item {
    margin-bottom: 50px;
}

.engine .engine-item>.icon {
    position: relative;
    padding: 0 22% 22% 0;
    text-align: center;
    min-height: 1px;
    float: left;
}

.engine .engine-item>.icon::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    padding: 0 100% 100% 0;
    background-color: #0078d7;
    border-radius: 5px;
    display: block;
}

.engine .engine-item>.icon>img {
    position: absolute;
    left: 50%;
    top: 50%;
    height: 90%;
    transform: translate(-50%, -50%);
    z-index: 11;
}

.engine .engine-item>.details {
    margin-left: 4%;
    width: 74%;
    float: left;
}

.engine .engine-item h4 {
    margin-top: 0;
    font-size: 20px;
}

.engine .engine-item p {
    color: #666666;
    line-height: 1.8;
}

@media screen and (max-width: 992px) {
    .engine>.container {
        background: url('../images/engine-bg-s.png') no-repeat 50% 60px;
    }
}

@media screen and (min-width: 992px) {
    .container {
        width: 1000px;
    }
}

@media screen and (min-width: 1440px) {
    .container {
        width: 1170px;
    }
}